When using Direct2D 1.0 we avoid operator source very strongly. When using Direct2D 1.1 we can use it, but we should use D2D 1.1's native support for it.

Hrm, I wonder if this might be incorrect for Canvas, since I think Canvas' operators are bound by the clip and not by the mask? Whereas I think D2D 1.1's PrimitiveBlend is bound by the operation mask. I wonder if we should add an extra operator COPY where it can be bound by the primitive.

As I thought this gives trouble with Canvas. I filed bug 1066407 for adding the right operator. Patch coming to implement it here.

A no longer incorrect for Canvas version. While we discuss the desiredness of this operator next week in Toronto, I'll add D2D 1.1 to the 'hack list' for now :).

Comment on attachment 8488395 [details] [diff] [review] Support fast operator source support in D2D 1.1 backend v2 Review of attachment 8488395 [details] [diff] [review]: ----------------------------------------------------------------- We're postponing this for now.